2556206122757 has 12 divisors (see below), whose sum is σ = 2976256576620. Its totient is φ = 2189036477376.

The previous prime is 2556206122751. The next prime is 2556206122781. The reversal of 2556206122757 is 7572216026552.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 574153237441 + 1982052885316 = 757729^2 + 1407854^2 .

It is not a de Polignac number, because 2556206122757 - 2¹⁸ = 2556205860613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2556206122751) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23723582 + ... + 23831087.

It is an arithmetic number, because the mean of its divisors is an integer number (248021381385).

Almost surely, 2^{2556206122757} is an apocalyptic number.

It is an amenable number.

2556206122757 is a deficient number, since it is larger than the sum of its proper divisors (420050453863).

2556206122757 is a wasteful number, since it uses less digits than its factorization.

2556206122757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47555780 (or 47555773 counting only the distinct ones).

The product of its (nonzero) digits is 3528000, while the sum is 50.

The spelling of 2556206122757 in words is "two trillion, five hundred fifty-six billion, two hundred six million, one hundred twenty-two thousand, seven hundred fifty-seven".